Module linux_io::fd::fcntl

A safer abstraction for fcntl.

The fcntl system call is very open-ended, supporting a variety of different operations with different argument and result types. Passing the wrong kind of value to the wrong command can cause memory corruption.

To make fcntl a little safer to use, this module provides command constants that also include information about the argument and result types, so that the super::File::fcntl method can then provide a type-safe interface as long as these constants are defined correctly.

Structs

• ConstPtrFcntlCmd
  Implementation of FcntlCmd with a fixed cmd value and passing the arg through to the underlying system call as a raw const pointer.
• DirectFcntlCmd
  Implementation of FcntlCmd with a fixed cmd value and passing the arg directly through to the underlying system call.
• MutPtrFcntlCmd
  Implementation of FcntlCmd with a fixed cmd value and passing the arg through to the underlying system call as a raw mut pointer.

Constants

• F_DUPFD
  Duplicate the file descriptor fd using the lowest-numbered available file descriptor greater than or equal to arg.
• F_DUPFD_CLOEXEC
  Duplicate the file descriptor fd using the lowest-numbered available file descriptor greater than or equal to arg, setting the FD_CLOEXEC flag on the new descriptor.
• F_GETFD
  Retrieve the function descriptor flags.
• F_GETFL
  Retrieve the file access mode and the file status flags.
• F_GETLK
  Place a lock on the file.
• F_OFD_GETLK
  Place a lock on the file description of the file.
• F_OFD_SETLK
  Acquire a lock or release a lock on the file description of the file.
• F_OFD_SETLKW
  Acquire a lock or release a lock on the file description of the file, waiting for any conflicting lock to be released.
• F_SETFD
  Set the function descriptor flags.
• F_SETFL
  Set the file status flags.
• F_SETLK
  Acquire a lock or release a lock on the file.
• F_SETLKW
  Acquire a lock or release a lock on the file, waiting for any conflicting lock to be released.

Traits

• FcntlCmd
  Represents a particular command that can be used with the fcntl system call.
• FromFcntlResult
  Trait for types that can be returned by fcntl calls.

Functions

• fcntl_cmd^⚠
  Constructs a new “simple” FcntlCmd with a fixed command code and an argument type that maps directly to the raw system call argument.
• fcntl_cmd_const_ptr^⚠
  Constructs a new FcntlCmd with a fixed command code and an argument type that will be passed as a raw const pointer.
• fcntl_cmd_mut_ptr^⚠
  Constructs a new FcntlCmd with a fixed command code and an argument type that will be passed as a raw mut pointer.